A coil of area A, turns N and carrying current i is placed with its face parallel to the lines of magnetic induction B. The work done in rotating the coil through an angle of 1800 is
2iNAB
iNAB2
Zero
iNAB
A
2iNAB
B
Zero
C
iNAB
D
iNAB2
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Solution
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The potential energy of a system of magnetic moment →M placed in magnetic field →B is U=−→M.→B
Hence the total work done in rotating the coil by 180∘ is
U2−U1=(MB)−(−MB)
=2MB=2iNAB
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